After upgrading from version 6.8.0 to 6.9.0 (without changing code, just rebuilding the application), I'm getting an error regarding GLSL. Btw, I'm not using any GLSL shader code ... unless OCCT's V3d_Viewer is indirectly.
My application gives the following error message:
Both environment variables CSF_ShadersDirectory and CASROOT are undefined!
At least one should be defined to use standard GLSL programs.